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Karcher k3.98 pressure washer not holding good presure

I check it took it apart and found that where the detergent feeds into the machine is crack is this fixable or is my unit shot?

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  • apat Apr 22, 2013

    very nice explaination by svoegele2, thanks i have a question on this, i have hairline crack at the same place( on housing of soap inlet valve), my question is if i dont wnats to use the soap despenser any more, can i just fill the soap valve housing with some hard material (like bondo) and just use my machine as washer only. so that way i dont have to buy a new upper housing. is it doable or itis required to be open for proper functioning of p. washer. thanks in advance



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Dear svoegele2,
Your machine is still good. You have to remove the 4 screws that are holding the head unit. The head unit consists of 2 parts. The outer part has Intake of water and delivery of water under pressure. It has an injector. It also has the chemical inlet attachment. This Detergent inlet valve can be replaced by a new one. (The bottom part of the head has the suction and delivery valves.)
Now this unit of 2 heads is held down with a steel cover. First release the holding down bolts( they could be allen screws or Torx Screws). If the inlet valve for the chemical is still good and t is turned 90 dgrees, twist it slowly to be alligned with the slot in the metal cover. But if this is broken, just remove the metal head and then remove by twisting,..the detergent inlet..(which is also a non return valve).
Carfull if you seperate the top half of the head from the bottom head...because underneath there is a smal spring and a small valve. Do not lose these.
Now if the machine has no pressure..change the bottom half of the head. If the machine is switching on and off...change the upper half f the head. Do not forget that small spring between the 2 heads If where the inlet for detergent in the head is cracked..this top head must be renewed for this reason also.
If all is OK...but only the inlet..where the detergent is broken....remove slowly the detergent inlet, by twisting a little,....and replace by a new one. First see that you have the NEW inlet of detergent before doing anything . Because if you do not find to buy a new on....and there is no damage to the upper can continue using the machine,...but with out having detergent. It is better using it without detergent than throwing the machine away. One final hint. Try the machine with the plastic cover removed, to see if there are any leaks or cracks in the head unit.(wear safety gogles). If only the inlet for detergent is broken and no water is escaping from it or the head, a new inlet detergent valve. If you do without detergent and you cannot find to buy a detergent inlet valve,...just close the machine and use it without detergent. When myself I service such machines...I change the whole head unit and detergent valve. Then the machine will be as good as new. And the spares are not that expensive. Better than buying another machine.

Posted on May 25, 2009


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